Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
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Question 281: Which of the following compounds will impart a brick-red colour to a non-luminious bunsen flame?
Options:
A) NaCl
B) LiCl
C) CaCl2
D) MgCl2
Show Answer
The correct answer is C .
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Question 282: The shapes of CO, HO and CH respectively are
Options:
A) bent, linear and tetrahedral
B) bent, tetrahedral and linear
C) linear, bent and tetrahedral
D) tetrahedral, linear and bent
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The correct answer is C .
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Question 283:
The compounds made up of only carbon and hydrogen are called?
Options:
A) Carbon compounds
B) Hydrocarbons
C) Atoms
D) Carbon hydrolysis
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The correct answer is B .
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Question 284: A mixture of sugar and sulphur can be separated by
Options:
A) dissolution in water, evapouration and filtration
B) filtration, evaporation and dissolution in water
C) dissolution in water, filtration and evaporation
D) evaporation, dissolution in water and filtration
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The correct answer is C .
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Question 285: The oxidation state of oxygen in tetraoxosulphate (VI) acid is
Options:
A) -4
B) -2
C) +4
D) -8
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The correct answer is B .
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Question 286:
In which of the following will hydrogen form ionic compound?
Options:
A) HCL
B) NaH
C) NH
D) CH
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The correct answer is B .
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Question 287: When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?
Options:
A) HCl
B) HOCl
C) O2
D) Cl2O
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The correct answer is C .
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Question 288: If the elements X and Y have atomic numbers 11 and 17 respectively, what type of bond can they form?
Options:
A) Dative
B) Covalent
C) Lonic
D) Metallic
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The correct answer is C .
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Question 289: The idea of planetary electron was that of
Options:
A) Rutherford
B) Thompson
C) Bohr
D) Dalton
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The correct answer is A .
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Question 290:
In order to electroplate spoon with silver, the arrangement of the electrolytic cell is?
Options:
A) the anode is a silver rod and the cathode is the spoon
B) the anode is the spoon and the cathode is a silver rod
C) the electrolyte is silver trioxonitrate(v)( solution and the cathode is a silver rod.
D) the electrolyte is silver trioxonitrate(v) solution and the anode is the spoon
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The correct answer is A .